CVE-2026-46713 PUBLISHED

Misskey: JSON-LD signature validation + compaction may lead to improper activity handling

Assigner: GitHub_M
Reserved: 15.05.2026 Published: 03.08.2026 Updated: 03.08.2026

Misskey is an open source, federated social media platform. Versions 12.37.0 and later, but prior to 2026.5.4, contain a vulnerability in the JSON-LD signature validation and compaction process that allows spoofed activities to be accepted as valid. This issue has been fixed in version 2026.5.4.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:H/SA:N
CVSS Score: 9.2

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	Low	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	High
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	misskey-dev
Product	misskey
Versions	Version >= 12.37.0, < 2026.5.4 is affected

References

Problem Types

CWE-347: Improper Verification of Cryptographic Signature CWE